/*------------------------------------------------------------------------------ File : mpega_decode_asm.h Author : Stéphane TAVENARD $VER: mpega_decode_asm.h 1.1 (24/07/1995) (C) Copyright 1995 Stéphane TAVENARD All Rights Reserved #Rev| Date | Comment ----|----------|-------------------------------------------------------- 0 |04/05/1995| Initial revision ST 1 |23/06/1995| Aminet release ST 2 |24/07/1995| Added Mixing frequency ST ------------------------------------------------------------------------ Definition of MPEG audio routines (optimized) ------------------------------------------------------------------------------*/ #ifndef MPEGA_DECODE_ASM_H #define MPEGA_DECODE_ASM_H #include "Bitstream.h" #include "AudioPort.h" #define SBLIMIT 32 #define SCALE_BLOCK 12 #define INT short #define MPEGA_SYNC_WORD (long)0xFFF #define MPEGA_SYNC_WORD_LNGTH 12 #define MPEGA_FILETYPE_RAW 0 #define MPEGA_FILETYPE_AIFF 1 /* Structure for Reading Layer II Allocation Tables from File */ typedef struct { unsigned int steps:16; unsigned int shift:4; unsigned int bits:5; unsigned int group:2; unsigned int quant:5; } sb_alloc, *alloc_ptr; typedef sb_alloc al_table[SBLIMIT][16]; /* Header Information Structure */ typedef struct { int version; int lay; int error_protection; int bitrate_index; int sampling_frequency; int padding; int extension; int mode; int mode_ext; int copyright; int original; int emphasis; } layer, *the_layer; /* Parent Structure Interpreting some Frame Parameters in Header */ typedef struct { layer *header; /* raw header information */ int actual_mode; /* when writing IS, may forget if 0 chs */ al_table *alloc; /* current bit allocation table */ int tab_num; /* number of allocation table */ int stereo; /* 1 for mono, 2 for stereo */ int jsbound; /* first band of joint stereo coding */ int sblimit; /* total number of sub bands */ int channels; /* # of channels to read (= stereo if not mono forced) */ int *bit_alloc; int *scfsi; int *scale_index; int *sample; INT *fraction; char *bitstream_name; BITSTREAM *bs; /* Bistream */ BYTE *out_buffer[ 2 ]; long out_buffer_size; int freq_div; int output_8bits; int quality; int mono_forced; int play; int audio_filter; char *out_file_name; int out_file_type; /* 0=raw PCM 1=AIFF */ FILE *out_file; int sub_band_size; int got_bits; int frame_count; int out_write_level; int out_write_length; int out_sample_length; int out_sample_freq; int bitstream_rate; /* kbit/sec */ int bitstream_freq; /* Hz */ int bitstream_buffer_size; AU_PORT *audio_port; int no_audio_wait; /* if set, don't wait audio writes */ int mixing_frequency; /* Use mixing if > 0 #3 */ } frame_params; #ifndef ASM #ifdef __SASC #define REG_A0 register __a0 #define REG_A1 register __a1 #define REG_A2 register __a2 #define REG_A3 register __a3 #define REG_A4 register __a4 #define REG_A5 register __a5 #define REG_A6 register __a6 #define REG_D0 register __d0 #define REG_D1 register __d1 #define REG_D2 register __d2 #define REG_D3 register __d3 #define REG_D4 register __d4 #define REG_D5 register __d5 #define REG_D6 register __d6 #define REG_D7 register __d7 #define ASM __asm __saved #else #define ASM_A0 __A0 #define ASM_A1 __A1 #define ASM_A2 __A2 #define ASM_A3 __A3 #define ASM_A4 __A4 #define ASM_A5 __A5 #define ASM_A6 __A6 #define ASM_D0 __D0 #define ASM_D1 __D1 #define ASM_D2 __D2 #define ASM_D3 __D3 #define ASM_D4 __D4 #define ASM_D5 __D5 #define ASM_D6 __D6 #define ASM_D7 __D7 #define ASM #endif #endif void ASM ASM_init_decode( ASM_D0 int sub_band_size, ASM_D1 int output_8bits, ASM_D2 int quality ); int ASM ASM_read_header( ASM_A0 frame_params *fr_ps ); void ASM ASM_decode_header( ASM_A0 frame_params *fr_ps ); void ASM ASM_I_decode_bitalloc( ASM_A0 frame_params *fr_ps ); void ASM ASM_I_decode_scale( ASM_A0 frame_params *fr_ps ); void ASM ASM_I_buffer_sample( ASM_A0 frame_params *fr_ps ); void ASM ASM_I_deqnorm( ASM_A0 frame_params *fr_ps ); void ASM ASM_II_decode_bitalloc( ASM_A0 frame_params *fr_ps ); void ASM ASM_II_decode_scale( ASM_A0 frame_params *fr_ps ); void ASM ASM_II_buffer_sample( ASM_A0 frame_params *fr_ps ); void ASM ASM_II_deqnorm( ASM_A0 frame_params *fr_ps, ASM_D0 int x ); LONG ASM ASM_sub_band_synthesis( ASM_A0 frame_params *fr_ps, ASM_D0 int band_count ); void ASM ASM_I_decode_frame( ASM_A0 frame_params *fr_ps ); void ASM ASM_II_decode_frame( ASM_A0 frame_params *fr_ps ); #endif /* MPEGA_DECODE_ASM_H */